Scientists studying penguins in Antarctica they were surprised, after they accidentally got irritated by the smoke from the birds' poop.
Researchers from Copenhagen University found that penguin guano (poo) contains large amounts of nitrous oxide, better known as hilarious gas.
Professor Bo Elberling, author of the study, said: “The guano penguin produces significantly high levels of nitrous oxide around its colonies. Maximum emissions are about 100 times greater than in a recently fertilized Danish field.
"It is really intense – mainly because nitrous oxide is 300 times more polluting than CO2".
In addition to affecting the climate, nitrous oxide can also act as a sedative in humans, slowing brain and body responses.
It is often used in dental offices to sedate patients and is also a recreational drug.
Professor Elberling explained: “After going through guano for several hours, someone is completely cuckoo.
"You start to feel sick and have a headache.
"The small nitrous oxide cylinders you see lying and floating around Copenhagen are no match for this heavy dose, which results from a combination of nitrous oxide with hydrogen sulfide and other gases."
The researchers hope the findings can help improve our understanding of the effect of penguin droppings on the climate.
Professor Elberling added: “Although nitrous oxide emissions in this case are not enough to impact the Earth's overall energy budget, our findings contribute to new insights into how penguin colonies affect the environment around them, which is interesting because colonies are generally becoming more and more widespread. . "